Source upgrade from 9-stable to 10-stable

[Tuomo Latto]

I don't think I've seen any explicit instructions for a source upgrade
(i.e. buildworld/installworld) from 9-stable to 10-stable.

Considering it is both another major version and a different compiler,
are there any obvious or non-obvious gotchas I should be watching out for?
Even all the stupid mistakes to avoid are welcome answers.
I don't want make those either.

BTW, no COMPAT_FREEBSD8 or COMPAT_FREEBSD9? Really?

-- 
Tuomo

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